Indian Standard
Specification for Lancing Pipes
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his Indian Standard was adopted by the Indian Standards
Institution on 30 November 1982, after the draft finalized by the
Steel Tubes, Pipes and Fittings Sectional Committee had been
approved by the Structural and Metals Division Council.
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This Indian Standard has been prepared to meet the requirements of
lancing pipes used by steel industry.
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Requirements for ceramic and other special coating to enhance the
life of the pipes will be added in due course after collecting the
necessary data.
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This standard contains clauses 2.4, 11.1 and 12.1 Which call for
agreement between the purchaser and the manufacturer.
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For the purpose of deciding whether a particular requirement of
this standard is complied with, the final value, observed or
calculated, expressing the result of a test or analysis, shall be
rounded off in accordance with IS: 2-1960. The number of
significant places retained in the rounded off value should be the
same as that of the specified value in this standard.
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This standard covers the requirements of butt-welded, screwed and
socketed and plain end mild steel pipes intended for use on oxygen
lancing.
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For the purpose of this standard,the following definitions shall
apply.
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Black Pipe: Pipe as manufactured, but without any
subsequent surface treatment.
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Length of Screwed and Socket Pipe: The length of
the pipe inclusive of the socket.
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Nominal Bore: A size reference denoting the
approximate bore of the pipe. For each size of pipe, the outside
diameter is fixed by the corresponding screw thread dimensions of
IS: 554-1975 and therefore, the actual bore of each size of pipe
will vary according to the thickness.
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Random Length: Normal manufacturing lengths which
may vary over a range of several meters. Alternatively, a length
range agreed to between the purchaser and the manufacturer.
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Socket: The screwed coupling utilized in joining
the pipes together.
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Pipe (Tube): A long, hollow, open-ended object of
circular or other cross-section. The term 'pipe' is synonymous
with the term 'tube'.
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Note 1: The length of the pipe inclusive of
the sockets means the pipe length measured with socket fitted
at one end to handling-tight.
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Note 2: Handling tight means that the socket
is so tight fitting that it should not fall down during
handling or transit.
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Note 3: The term 'socket' is synonymous with
the term 'coupler'.
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Mild steel pipes covered by this standard shall be designated by
their nominal bore, and shall be further classified as 'light',
'medium' and 'heavy' depending on the wall thickness.
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Mild steel socket shall be designated by the respective nominal
bore of the pipe for which it is intended.
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General requirements relating to the supply of mild steel pipes
and sockets shall conform to IS:1387-1967.
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Lancing pipes shall be supplied with any of the following
combinations as specified by the customer:
- Plain end
- Both ends screwed and one end socket
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Pipes shall be manufactured from mild steel made by open hearth,
electric or any of the oxygen processes.
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Steel pipes and sockets shall be manufactured by one of the
following processes:
- Continuous oxy-acetylene gas welded pipes (OAW)
- Electric resistance welded (ERW)
- High frequency induction welded (HFIW)
- Hot-finished welded (HFW)
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Pipes made by manual welding are not covered by this
specification.
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Hand welding of sockets may be permitted provided the test
requirements for the sockets covered by the standard are complied
with.
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Sockets may also be manufactured from rods provided the test
requirements for the sockets covered by the standard are complied
with.
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The dimensions of pipes shall be in accordance with Table 1, 2 and
3 subject to the tolerances permitted in 8. Dimensions of sockets
shall be in accordance with Table 4.
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Nominal masses of 'light', 'medium' and 'heavy' black pipes shall
be as specified in Table 1, 2 and 3 respectively.
Dimensions & Nominal Masses of Black Steel Pipes (Light)
| 6 |
10.1 |
9.7 |
1.8 |
0.361 |
0.364 |
| 8 |
13.6 |
13.2 |
1.8 |
0.517 |
0.521 |
| 10 |
17.1 |
16.7 |
1.8 |
0.674 |
0.680 |
| 15 |
21.4 |
21.0 |
2.0 |
0.952 |
0.961 |
| 20 |
26.9 |
26.4 |
2.35 |
1.41 |
1.42 |
| 25 |
33.8 |
33.2 |
2.65 |
2.01 |
2.03 |
